Process for electrodeposition of copper.



' No Drawing.

UNITED STATES PATENT OFFICE.

STEPHEN o. BAIBCOOK, or HAMBURG, AND ELMER w. HAGMAIER, or LAcKLwANNA,

. new YORK.

PROCESS FOR ELECTBODEPO'SITION OF COPPER. v

To all whom it may concern:

Be it known that we, STEPHEN C. BAB- oocx and ELMER W. HAGMAIER, citizens ofthe United States, residing at Hamburg and Lackawanna, respectively, in the county of Erie and State of New York, have invented new and useful Improvements in Processes for ,Electrodeposition of Copper, of which the time necessary to get a required deposit of copper and at the same time secure a deposit that is dense andthat will fill every crack and crevice, and consequently give a most perfect coatingor a most perfect plate. In carrying out our. process we employ the common and well-known apparatus, which needs no description. I

The special and novel feature of our in- I vention is the electro-deposition of copper from a solution containing copper sulfate, sulfuric acid, creosote, phenol, crysyl hydrate or cresylol, phlorol, and gaiacol. The addition of these phenolic homologues causes a harder and firmer deposition, causes the copper to deposit in the smallest indentations, and also increases the rate of deposition. These conditions we understand trical deposition of copper comprising addare brought about by the phenol hoinologues keeping the metal ions at a constant concentration at the cathode, and preventing all ions which "usually migrate to the anode from transporting electricity. It'also would appear, from the perfectness of the deposition, thattheaddition of said ingredient prevents pocketing of gases on the cathode and thus secures a more perfect filling of all interstices. v

The following is a specific adaptation of Specification of Letters Patent.

- Patented Mar. '7, 1916.

Application filed July 12, 1915. Serial No. 39,384.

our generic invention. The bath is made up in the usual way, having about two hundred and seventy pounds of-copper sulfate dissolved in about two hundred and forty gallons of water. To this is added about fortynine ounces of phenol. sulfonic'acid, properly prepared so that the phenol is thor oughly combined with the sulfuric acid.

.The current employed is between three and four volts and. the amperage is about seven hundred and fifty to a two hundred and forty gallon tank. The current density is somewhat variable, and can be varied depending upon the acidity of the solution.

Operation. and test of these improvements show a time-reduction over previouslyknown methods of about fifty per cent, and

as above stated, the deposition is 'much more perfect and of greater density.

Having thus described our invention and its method of operation, and without limiting ourselves to the proportions, or amounts, of to any species of the genus employed, we 0 a1m:-

- 1. The herein described process of electrodeposition comprising adding to, a copper sulfate bath a phenol compound, and applying current in the usual. manner.

2. The herein described process of electro-deposition comprisingadding to an ordinary sulfate of copper bath, phenol sulfonic acid in substantially the proportions above described, and applying current as described.

3. The herein described process of elecing' to an ordinary sulfate of copper-bath a phenol treated with sulfuric acid in approximately the proportions above described, and applying current 'in the usual manner. v

' STEPHEN C. BABCOOK.

ELMER W. HAGMAIEB. Witnesses: 7

-ARTHUR J. Monro, ARTHUR R. JENKINS. 

